[1.7.x] Fixed #24097 -- Prevented AttributeError in redirect_to_login

Thanks Peter Schmidt for the report and the initial patch.
Thanks to Oktay Sancak for writing the original failing test and
Alvin Savoy for supporting contributing back to the community.
Backport of d7bc37d61 from master.

tests/resolve_url/tests.py

@@ -1,9 +1,10 @@
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import NoReverseMatch
+from django.core.urlresolvers import NoReverseMatch, reverse_lazy
 from django.contrib.auth.views import logout
 from django.shortcuts import resolve_url
 from django.test import TestCase
+from django.utils import six
 
 from .models import UnimportantThing
 
@@ -55,6 +56,15 @@ class ResolveUrlTests(TestCase):
         resolved_url = resolve_url(logout)
         self.assertEqual('/accounts/logout/', resolved_url)
 
+    def test_lazy_reverse(self):
+        """
+        Tests that passing the result of reverse_lazy is resolved to a real URL
+        string.
+        """
+        resolved_url = resolve_url(reverse_lazy('logout'))
+        self.assertIsInstance(resolved_url, six.text_type)
+        self.assertEqual('/accounts/logout/', resolved_url)
+
     def test_valid_view_name(self):
         """
         Tests that passing a view function to ``resolve_url`` will result in